Ink composition, inkjet recording method, and printed material

Abstract

This invention provides an ink composition capable of forming an image which has favorable curing sensitivity, is excellent in rubbing resistance and blocking properties, and has controlled surface stickiness and improved surface curing properties, an inkjet recording method using the ink composition, and a printed material; and the ink composition containing a polymer (a) including a partial structure selected from the group consisting of fluorine-substituted hydrocarbon group, a siloxane skeleton group, and a long-chain alkyl group; a radical polymerizable group, and a tertiary amine structure.

1. An ink composition comprising a polymer (a) having a radical polymerizable group, a tertiary amine structure, and a partial structure selected from the group consisting of a fluorine-substituted hydrocarbon group, a siloxane skeleton, and a C 6 -C 40  alkyl group. 
     
     
       2. The ink composition according to  claim 1 , wherein the fluorine-substituted hydrocarbon group is incorporated into the polymer using at least one monomer represented by Formula II: 
       
         
           
           
               
               
           
         
       
       wherein in Formula (II), R 1  represents a hydrogen atom, a halogen atom, a methyl group which may have a substituent group, or an ethyl group which may have a substituent group; R 2  and R 3  each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; X represents a covalent bond or a divalent connecting group (organic group); m represents an integer of 0 or more; and n represents an integer of 1 or more. 
     
     
       3. The ink composition according to  claim 1 , wherein the siloxane skeleton is at least one polysiloxane in which a compound represented by Formula (A) has been polymerized; 
       
         
           
           
               
               
           
         
       
       wherein in Formula (A), R 1  represents a straight or branched alkylene group having 2 to 6 carbon atoms or a divalent connecting group represented by Formula (B); x 1 , x 2 , and x 3  each represent an integer in which the total of x 1 , x 2 , and x 3  is from 1 to 100; y 1  represents an integer of from 1 to 10; X represents a single bond or a divalent group represented by Formula (C); Y is a group selected from those represented by Formulae (D) to (F); and Z represents a monovalent group represented by the following structure; 
       
         
           
           
               
               
           
         
       
       wherein in the above structure, z 1  represents an integer of from 3 to 100; 
       
         
           
           
               
               
           
         
       
       wherein in Formula (B), R 2  represents a hydrogen atom or a methyl group, and n represents an integer of from 1 to 50;
   —Z 1 —CO—NH—R 3 —NH—CO—  Formula (C)
 
 
       wherein in Formula (C), Z 1  represents an oxygen atom, a sulfur atom, or NR 4 ; R 4  represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; Z 1  is bonded to R 1  in Formula (A); and R 3  represents a divalent aliphatic or alicyclic group having 6 to 10 carbon atoms; 
       
         
           
           
               
               
           
         
       
       wherein in Formulae (D) to (F), R 5  represents a hydrogen atom or a straight chain or branched chain alkyl group having 1 to 6 carbon atoms, R 6  represents a straight chain or branched chain alkylene group having 2 to 10 carbon atoms, and R 7  represents a straight chain or branched chain alkylene group having 1 to 6 carbon atoms. 
     
     
       4. The ink composition according to  claim 1 , wherein the C 6 -C 40  alkyl group is at least one group represented by —C n H 2n+1 . 
     
     
       5. The ink composition according to  claim 1 , wherein the tertiary amine structure is the following structure, 
       
         
           
           
               
               
           
         
       
       wherein in the above structure, R and R 1  represent a straight chain, branched, or cyclic alkylene group having 1 to 6 carbon atoms; Z represents an oxygen atom, —C (═O) O—, —OC (═O) NH—, or —NHC (═O) NH—; R 2  and R 3  represent a straight chain, branched, or cyclic alkyl group having 1 to 6 carbon atoms; R 1  and R 2 , or R 2  and R 3  may be mutually bonded to each other to form a ring having 5 to 7 carbon atoms; and the ring may have a substituent group. 
     
     
       6. The ink composition according to  claim 1 , further comprising a radical polymerizable compound (b) and a photoinitiator (c). 
     
     
       7. The ink composition according to  claim 6 , wherein a content of the radical polymerizable compound (b) is from 60% by mass to 90% by mass based on the total solid content of the ink composition. 
     
     
       8. An inkjet recording method comprising:
 ejecting on a recordable medium the ink composition of  claim 1  using an inkjet recording apparatus; and 
 curing the ink composition by irradiation of an actinic radiation ray to the ejected ink composition. 
 
     
     
       9. A printed material which is recorded by the inkjet recording method of  claim 8 .